Document Detail


Comparison of Twin-block and Dynamax appliances for the treatment of Class II malocclusion in adolescents: a randomized controlled trial.
MedLine Citation:
PMID:  20691354     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
INTRODUCTION: The aim of this study was to compare the effectiveness of Twin-block and Dynamax appliances for the treatment of Class II Division 1 malocclusion. METHODS: This was a randomized controlled trial involving 32 boys and 32 girls aged 10 to 14 years with Class II Division 1 malocclusion. They were randomly allocated to either the Dynamax appliance group or the Twin-block appliance group. Treatment was provided by 4 clinicians at 2 centers. Records were taken at the start and the end of the functional phase and after all treatment. In addition, incisal overjet, the number of appliance breakages, and adverse events or side effects of the treatment were recorded at each patient visit. RESULTS: The data monitoring committee in an interim analysis at 18 months after the start of the trial found significantly greater overjet reduction in the Twin-block group than in the Dynamax group and more breakages and adverse events with the Dynamax appliance. As a result, treatment with the Dynamax appliance was terminated, and those patients completed treatment with the Twin-block or a fixed appliance. Regression analysis showed a statistically significant difference in the performance over time between the Twin-block and Dynamax appliances in terms of reduction in overjet, with the Twin-block appliance performing significantly better than the Dynamax. The incidence of adverse events was greater in the Dynamax group (82%) than in the Twin-block group (16%), with a statistically significant difference (P <0.001) between the 2 groups. CONCLUSIONS: The Twin-block appliance was more effective than the Dynamax appliance when overjet was evaluated and the Dynamax appliance patients reported greater incidence of adverse events with their appliance than those who were treated with the Twin-block appliance.
Authors:
Badri Thiruvenkatachari; Jonathan Sandler; Alison Murray; Tanya Walsh; Kevin O'Brien
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Publication Detail:
Type:  Journal Article; Multicenter Study; Randomized Controlled Trial    
Journal Detail:
Title:  American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics     Volume:  138     ISSN:  1097-6752     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-09     Completed Date:  2010-09-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  144.e1-9; discussion 144-5     Citation Subset:  D; IM    
Copyright Information:
Copyright (c) 2010 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
Affiliation:
Department of Orthodontics, School of Dentistry, University of Manchester, Higher Cambridge St., Manchester, United Kingdom. badri.t@manchester.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Child
Early Termination of Clinical Trials
Evidence-Based Dentistry / methods
Female
Humans
Male
Malocclusion, Angle Class II / therapy*
Mandibular Advancement / instrumentation*,  methods
Orthodontic Appliance Design*
Orthodontic Appliances, Functional*
Orthodontics, Corrective / instrumentation*,  methods
Patient Dropouts
Statistics, Nonparametric
Treatment Outcome

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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